In addition to the OS update, users can expect new firmware, which on the Lumia 920 fixes the soft-focus problem with the 8.7MP PureView camera (see our before and after comparison here). Other enhancements include audio-leveling and an improved (more sensitive) light sensor.

Old Firmware (L) versus New Firmware (R)

Use can manually check for an update by heading into Settings –> Phone Update –> Check for updates, otherwise they will be notified by a message. The update is downloadable over-the-air and should take about 20 minutes.

Nokia and carriers are expected to rollout Portico over the next few weeks, wrapping up in March.

Same like the mango and post mango updates on my HTC hd7 all the German branded versions got the update before my unbranded one. which ist actually odd since the unbranded doesn't have to go through carrier testing....
Btw unbranded l920y no update so far